## ComparisonEvaluationResult class

The comparison evaluation result.
To learn more, visit the [Working with Fields](https://docs.aspose.com/words/python-net/working-with-fields/) documentation article.




### Constructors
| Name | Description |
| --- | --- |
| [ComparisonEvaluationResult(result)](./__init__/#bool) | Creates a comparison evaluation result. |
| [ComparisonEvaluationResult(error_message)](./__init__/#str) | Creates a failed comparison evaluation result with the corresponding error message. |

### Properties

| Name | Description |
| --- | --- |
| [error_message](./error_message/) | Gets the failed comparison evaluation result's error message. |
| [result](./result/) | Gets the comparison evaluation result. |

### Examples

Shows how to implement custom evaluation for the IF and COMPARE fields (ComparisonExpressionEvaluator).

```python
class ComparisonExpressionEvaluator(aw.fields.IComparisonExpressionEvaluator):

    def __init__(self, result):
        self.m_invocations = []
        self.m_result = result
        if self.m_result != None:
            print(self.m_result.error_message)
            print(self.m_result.result)

    def evaluate(self, field, expression):
        self.m_invocations.append([expression.left_expression, expression.comparison_operator, expression.right_expression])
        return self.m_result

    def assert_invocations_count(self, expected):
        self.assertEqual(expected, len(self.m_invocations))
        return self

    def assert_invocation_arguments(self, invocation_index, expected_left_expression, expected_comparison_operator, expected_right_expression):
        arguments = self.m_invocations[invocation_index]
        self.assertEqual(expected_left_expression, arguments[0])
        self.assertEqual(expected_comparison_operator, arguments[1])
        self.assertEqual(expected_right_expression, arguments[2])
        return self
```

### See Also

* module [aspose.words.fields](../)